[racket] How to handle exit of a GRacket application?

You probably want to augment `on-close' in `frame%', for example:
#lang racket/gui

(send
 (new (class frame% (super-new)
        (define/augment (on-close)
          (displayln "Exiting...")))
      [label "Frame"]
      [width 400] [height 200])
 show #t)

which on my machine prints "Exiting..." when I click to closing cross.

Laurent


On Sun, Sep 8, 2013 at 4:07 AM, Eric Dong <ericcesium133 at gmail.com> wrote:

> Hi there,
>
> My Racket GUI application needs to do a lot of cleanup work when exiting,
> i.e. when the user presses the X button. Wrapping the .rkt in a shell
> script which waits and then does the cleanup is a bit too hacky for me.
> There are many exit handlers in the Racket documentation (exit-handler etc)
> but none of them seem to work!
>
> Thanks a whole ton!
>
> Yuhao Dong
>
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>   http://lists.racket-lang.org/users
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